.leaflet-container .leaflet-control-mousetips {
  background: #363636;
  background: rgba(0,0,0,0.5);
  border: 1px solid transparent;
  -webkit-border-radius: 4px;
  border-radius: 4px;
  color: #fff;
  font: 12px/18px "Helvetica Neue",Arial,Helvetica,sans-serif;
  margin-left: 20px;
  margin-top: -15px;
  padding: 4px 8px;
  position: absolute;
  visibility: inherit;
  white-space: nowrap;
  z-index: 6;
  display: none;
}
 
 
.leaflet-container .leaflet-control-mousetips:before{
  border-right: 6px solid black;
  border-right-color: rgba(0,0,0,0.5);
  border-top: 6px solid transparent;
  border-bottom: 6px solid transparent;
  content: "";
  position: absolute;
  top: 7px;
  left: -7px;
}